<input type="file" accept="image/*" />

accept表示可以上传文件类型，image表示图片，*表示所有支持的格式。VUE不好用

accept可以指定如下信息：

后各文档如docx需配置的accept属性值

Extension MIME Type.xlsx application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.xltx application/vnd.openxmlformats-officedocument.spreadsheetml.template.potx application/vnd.openxmlformats-officedocument.presentationml.template.ppsx application/vnd.openxmlformats-officedocument.presentationml.slideshow.pptx application/vnd.openxmlformats-officedocument.presentationml.presentation.sldx application/vnd.openxmlformats-officedocument.presentationml.slide.docx application/vnd.openxmlformats-officedocument.wordprocessingml.document.dotx application/vnd.openxmlformats-officedocument.wordprocessingml.template.xlsm application/vnd.ms-excel.addin.macroEnabled.12.xlsb application/vnd.ms-excel.sheet.binary.macroEnabled.12